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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package apparmor_test
import (
"strings"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
"github.com/snapcore/snapd/interfaces/ifacetest"
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/snap/snaptest"
"github.com/snapcore/snapd/testutil"
)
type specSuite struct {
testutil.BaseTest
iface *ifacetest.TestInterface
spec *apparmor.Specification
plugInfo *snap.PlugInfo
plug *interfaces.ConnectedPlug
slotInfo *snap.SlotInfo
slot *interfaces.ConnectedSlot
}
var _ = Suite(&specSuite{
iface: &ifacetest.TestInterface{
InterfaceName: "test",
AppArmorConnectedPlugCallback: func(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
spec.AddSnippet("connected-plug")
return nil
},
AppArmorConnectedSlotCallback: func(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
spec.AddSnippet("connected-slot")
return nil
},
AppArmorPermanentPlugCallback: func(spec *apparmor.Specification, plug *snap.PlugInfo) error {
spec.AddSnippet("permanent-plug")
return nil
},
AppArmorPermanentSlotCallback: func(spec *apparmor.Specification, slot *snap.SlotInfo) error {
spec.AddSnippet("permanent-slot")
return nil
},
},
plugInfo: &snap.PlugInfo{
Snap: &snap.Info{SuggestedName: "snap1"},
Name: "name",
Interface: "test",
Apps: map[string]*snap.AppInfo{
"app1": {
Snap: &snap.Info{
SuggestedName: "snap1",
},
Name: "app1"}},
},
slotInfo: &snap.SlotInfo{
Snap: &snap.Info{SuggestedName: "snap2"},
Name: "name",
Interface: "test",
Apps: map[string]*snap.AppInfo{
"app2": {
Snap: &snap.Info{
SuggestedName: "snap2",
},
Name: "app2"}},
},
})
func (s *specSuite) SetUpTest(c *C) {
s.BaseTest.SetUpTest(c)
s.BaseTest.AddCleanup(snap.MockSanitizePlugsSlots(func(snapInfo *snap.Info) {}))
s.spec = &apparmor.Specification{}
s.plug = interfaces.NewConnectedPlug(s.plugInfo, nil, nil)
s.slot = interfaces.NewConnectedSlot(s.slotInfo, nil, nil)
}
func (s *specSuite) TearDownTest(c *C) {
s.BaseTest.TearDownTest(c)
}
// The spec.Specification can be used through the interfaces.Specification interface
func (s *specSuite) TestSpecificationIface(c *C) {
var r interfaces.Specification = s.spec
c.Assert(r.AddConnectedPlug(s.iface, s.plug, s.slot), IsNil)
c.Assert(r.AddConnectedSlot(s.iface, s.plug, s.slot), IsNil)
c.Assert(r.AddPermanentPlug(s.iface, s.plugInfo), IsNil)
c.Assert(r.AddPermanentSlot(s.iface, s.slotInfo), IsNil)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.snap1.app1": {"connected-plug", "permanent-plug"},
"snap.snap2.app2": {"connected-slot", "permanent-slot"},
})
}
// AddSnippet adds a snippet for the given security tag.
func (s *specSuite) TestAddSnippet(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
// Add two snippets in the context we are in.
s.spec.AddSnippet("snippet 1")
s.spec.AddSnippet("snippet 2")
// The snippets were recorded correctly.
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.demo.command": {"snippet 1", "snippet 2"},
"snap.demo.service": {"snippet 1", "snippet 2"},
})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string{"snippet 1", "snippet 2"})
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "snippet 1\nsnippet 2")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string{"snap.demo.command", "snap.demo.service"})
}
// AddDeduplicatedSnippet adds a snippet for the given security tag.
func (s *specSuite) TestAddDeduplicatedSnippet(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
// Add two snippets in the context we are in.
s.spec.AddDeduplicatedSnippet("dedup snippet 1")
s.spec.AddDeduplicatedSnippet("dedup snippet 1")
s.spec.AddDeduplicatedSnippet("dedup snippet 2")
s.spec.AddDeduplicatedSnippet("dedup snippet 2")
// The snippets were recorded correctly.
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.demo.command": {"dedup snippet 1", "dedup snippet 2"},
"snap.demo.service": {"dedup snippet 1", "dedup snippet 2"},
})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string{"dedup snippet 1", "dedup snippet 2"})
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "dedup snippet 1\ndedup snippet 2")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string{"snap.demo.command", "snap.demo.service"})
}
func (s *specSuite) TestAddParametricSnippet(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
s.spec.AddParametricSnippet([]string{"prefix ", " postfix"}, "param1")
s.spec.AddParametricSnippet([]string{"prefix ", " postfix"}, "param1")
s.spec.AddParametricSnippet([]string{"prefix ", " postfix"}, "param2")
s.spec.AddParametricSnippet([]string{"prefix ", " postfix"}, "param2")
s.spec.AddParametricSnippet([]string{"other "}, "param")
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string{
"other param",
"prefix {param1,param2} postfix",
})
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "other param\nprefix {param1,param2} postfix")
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.demo.command": {"other param", "prefix {param1,param2} postfix"},
"snap.demo.service": {"other param", "prefix {param1,param2} postfix"},
})
}
// All of AddSnippet, AddDeduplicatedSnippet, AddParameticSnippet work correctly together.
func (s *specSuite) TestAddSnippetAndAddDeduplicatedAndParamSnippet(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
// Add three snippets in the context we are in.
s.spec.AddSnippet("normal")
s.spec.AddDeduplicatedSnippet("dedup")
s.spec.AddParametricSnippet([]string{""}, "param")
// The snippets were recorded correctly.
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.demo.command": {"normal", "dedup", "param"},
"snap.demo.service": {"normal", "dedup", "param"},
})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string{"normal", "dedup", "param"})
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "normal\ndedup\nparam")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string{"snap.demo.command", "snap.demo.service"})
}
// Define tags but don't add any snippets.
func (s *specSuite) TestTagsButNoSnippets(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string(nil))
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string(nil))
}
// Don't define any tags but add snippets.
func (s *specSuite) TestNoTagsButWithSnippets(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{})
defer restore()
s.spec.AddSnippet("normal")
s.spec.AddDeduplicatedSnippet("dedup")
s.spec.AddParametricSnippet([]string{""}, "param")
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string(nil))
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string(nil))
}
// Don't define any tags or snippets.
func (s *specSuite) TestsNoTagsOrSnippets(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{})
defer restore()
c.Assert(s.spec.UpdateNS(), HasLen, 0)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{})
c.Assert(s.spec.SnippetsForTag("snap.demo.command"), DeepEquals, []string(nil))
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "")
c.Assert(s.spec.SecurityTags(), DeepEquals, []string(nil))
}
// AddUpdateNS adds a snippet for the snap-update-ns profile for a given snap.
func (s *specSuite) TestAddUpdateNS(c *C) {
restore := apparmor.SetSpecScope(s.spec, []string{"snap.demo.command", "snap.demo.service"})
defer restore()
// Add a two snap-update-ns snippets in the context we are in.
s.spec.AddUpdateNS("s-u-n snippet 1")
s.spec.AddUpdateNS("s-u-n snippet 2")
// Check the order of the snippets can be retrieved.
idx, ok := s.spec.UpdateNSIndexOf("s-u-n snippet 2")
c.Assert(ok, Equals, true)
c.Check(idx, Equals, 1)
// The snippets were recorded correctly and in the right place.
c.Assert(s.spec.UpdateNS(), DeepEquals, []string{
"s-u-n snippet 1", "s-u-n snippet 2",
})
c.Assert(s.spec.SnippetForTag("snap.demo.command"), Equals, "")
c.Assert(s.spec.SecurityTags(), HasLen, 0)
}
const snapWithLayout = `
name: vanguard
version: 0
apps:
vanguard:
command: vanguard
layout:
/usr/foo:
bind: $SNAP/usr/foo
/var/tmp:
type: tmpfs
mode: 1777
/var/cache/mylink:
symlink: $SNAP_DATA/link/target
/etc/foo.conf:
bind-file: $SNAP/foo.conf
`
func (s *specSuite) TestApparmorSnippetsFromLayout(c *C) {
snapInfo := snaptest.MockInfo(c, snapWithLayout, &snap.SideInfo{Revision: snap.R(42)})
restore := apparmor.SetSpecScope(s.spec, []string{"snap.vanguard.vanguard"})
defer restore()
s.spec.AddLayout(snapInfo)
c.Assert(s.spec.Snippets(), DeepEquals, map[string][]string{
"snap.vanguard.vanguard": {
"# Layout path: /etc/foo.conf\n\"/etc/foo.conf\" mrwklix,",
"# Layout path: /usr/foo\n\"/usr/foo{,/**}\" mrwklix,",
"# Layout path: /var/cache/mylink\n# (no extra permissions required for symlink)",
"# Layout path: /var/tmp\n\"/var/tmp{,/**}\" mrwklix,",
},
})
updateNS := s.spec.UpdateNS()
profile0 := ` # Layout /etc/foo.conf: bind-file $SNAP/foo.conf
mount options=(bind, rw) "/snap/vanguard/42/foo.conf" -> "/etc/foo.conf",
mount options=(rprivate) -> "/etc/foo.conf",
umount "/etc/foo.conf",
# Writable mimic /etc
# .. permissions for traversing the prefix that is assumed to exist
"/" r,
# .. variant with mimic at /etc/
# Allow reading the mimic directory, it must exist in the first place.
"/etc/" r,
# Allow setting the read-only directory aside via a bind mount.
"/tmp/.snap/etc/" rw,
mount options=(rbind, rw) "/etc/" -> "/tmp/.snap/etc/",
# Allow mounting tmpfs over the read-only directory.
mount fstype=tmpfs options=(rw) tmpfs -> "/etc/",
# Allow creating empty files and directories for bind mounting things
# to reconstruct the now-writable parent directory.
"/tmp/.snap/etc/*/" rw,
"/etc/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/etc/*/" -> "/etc/*/",
"/tmp/.snap/etc/*" rw,
"/etc/*" rw,
mount options=(bind, rw) "/tmp/.snap/etc/*" -> "/etc/*",
# Allow unmounting the auxiliary directory.
# TODO: use fstype=tmpfs here for more strictness (LP: #1613403)
mount options=(rprivate) -> "/tmp/.snap/etc/",
umount "/tmp/.snap/etc/",
# Allow unmounting the destination directory as well as anything
# inside. This lets us perform the undo plan in case the writable
# mimic fails.
mount options=(rprivate) -> "/etc/",
mount options=(rprivate) -> "/etc/*",
mount options=(rprivate) -> "/etc/*/",
umount "/etc/",
umount "/etc/*",
umount "/etc/*/",
# Writable mimic /snap/vanguard/42
"/snap/" r,
"/snap/vanguard/" r,
# .. variant with mimic at /snap/vanguard/42/
"/snap/vanguard/42/" r,
"/tmp/.snap/snap/vanguard/42/" rw,
mount options=(rbind, rw) "/snap/vanguard/42/" -> "/tmp/.snap/snap/vanguard/42/",
mount fstype=tmpfs options=(rw) tmpfs -> "/snap/vanguard/42/",
"/tmp/.snap/snap/vanguard/42/*/" rw,
"/snap/vanguard/42/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/snap/vanguard/42/*/" -> "/snap/vanguard/42/*/",
"/tmp/.snap/snap/vanguard/42/*" rw,
"/snap/vanguard/42/*" rw,
mount options=(bind, rw) "/tmp/.snap/snap/vanguard/42/*" -> "/snap/vanguard/42/*",
mount options=(rprivate) -> "/tmp/.snap/snap/vanguard/42/",
umount "/tmp/.snap/snap/vanguard/42/",
mount options=(rprivate) -> "/snap/vanguard/42/",
mount options=(rprivate) -> "/snap/vanguard/42/*",
mount options=(rprivate) -> "/snap/vanguard/42/*/",
umount "/snap/vanguard/42/",
umount "/snap/vanguard/42/*",
umount "/snap/vanguard/42/*/",
`
// Find the slice that describes profile0 by looking for the first unique
// line of the next profile.
start := 0
end, _ := s.spec.UpdateNSIndexOf(" # Layout /usr/foo: bind $SNAP/usr/foo\n")
c.Assert(strings.Join(updateNS[start:end], ""), Equals, profile0)
profile1 := ` # Layout /usr/foo: bind $SNAP/usr/foo
mount options=(rbind, rw) "/snap/vanguard/42/usr/foo/" -> "/usr/foo/",
mount options=(rprivate) -> "/usr/foo/",
umount "/usr/foo/",
# Writable mimic /usr
# .. variant with mimic at /usr/
"/usr/" r,
"/tmp/.snap/usr/" rw,
mount options=(rbind, rw) "/usr/" -> "/tmp/.snap/usr/",
mount fstype=tmpfs options=(rw) tmpfs -> "/usr/",
"/tmp/.snap/usr/*/" rw,
"/usr/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/usr/*/" -> "/usr/*/",
"/tmp/.snap/usr/*" rw,
"/usr/*" rw,
mount options=(bind, rw) "/tmp/.snap/usr/*" -> "/usr/*",
mount options=(rprivate) -> "/tmp/.snap/usr/",
umount "/tmp/.snap/usr/",
mount options=(rprivate) -> "/usr/",
mount options=(rprivate) -> "/usr/*",
mount options=(rprivate) -> "/usr/*/",
umount "/usr/",
umount "/usr/*",
umount "/usr/*/",
# Writable mimic /snap/vanguard/42/usr
# .. variant with mimic at /snap/vanguard/42/usr/
"/snap/vanguard/42/usr/" r,
"/tmp/.snap/snap/vanguard/42/usr/" rw,
mount options=(rbind, rw) "/snap/vanguard/42/usr/" -> "/tmp/.snap/snap/vanguard/42/usr/",
mount fstype=tmpfs options=(rw) tmpfs -> "/snap/vanguard/42/usr/",
"/tmp/.snap/snap/vanguard/42/usr/*/" rw,
"/snap/vanguard/42/usr/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/snap/vanguard/42/usr/*/" -> "/snap/vanguard/42/usr/*/",
"/tmp/.snap/snap/vanguard/42/usr/*" rw,
"/snap/vanguard/42/usr/*" rw,
mount options=(bind, rw) "/tmp/.snap/snap/vanguard/42/usr/*" -> "/snap/vanguard/42/usr/*",
mount options=(rprivate) -> "/tmp/.snap/snap/vanguard/42/usr/",
umount "/tmp/.snap/snap/vanguard/42/usr/",
mount options=(rprivate) -> "/snap/vanguard/42/usr/",
mount options=(rprivate) -> "/snap/vanguard/42/usr/*",
mount options=(rprivate) -> "/snap/vanguard/42/usr/*/",
umount "/snap/vanguard/42/usr/",
umount "/snap/vanguard/42/usr/*",
umount "/snap/vanguard/42/usr/*/",
`
// Find the slice that describes profile1 by looking for the first unique
// line of the next profile.
start = end
end, _ = s.spec.UpdateNSIndexOf(" # Layout /var/cache/mylink: symlink $SNAP_DATA/link/target\n")
c.Assert(strings.Join(updateNS[start:end], ""), Equals, profile1)
profile2 := ` # Layout /var/cache/mylink: symlink $SNAP_DATA/link/target
"/var/cache/mylink" rw,
# Writable mimic /var/cache
# .. variant with mimic at /var/
"/var/" r,
"/tmp/.snap/var/" rw,
mount options=(rbind, rw) "/var/" -> "/tmp/.snap/var/",
mount fstype=tmpfs options=(rw) tmpfs -> "/var/",
"/tmp/.snap/var/*/" rw,
"/var/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/var/*/" -> "/var/*/",
"/tmp/.snap/var/*" rw,
"/var/*" rw,
mount options=(bind, rw) "/tmp/.snap/var/*" -> "/var/*",
mount options=(rprivate) -> "/tmp/.snap/var/",
umount "/tmp/.snap/var/",
mount options=(rprivate) -> "/var/",
mount options=(rprivate) -> "/var/*",
mount options=(rprivate) -> "/var/*/",
umount "/var/",
umount "/var/*",
umount "/var/*/",
# .. variant with mimic at /var/cache/
"/var/cache/" r,
"/tmp/.snap/var/cache/" rw,
mount options=(rbind, rw) "/var/cache/" -> "/tmp/.snap/var/cache/",
mount fstype=tmpfs options=(rw) tmpfs -> "/var/cache/",
"/tmp/.snap/var/cache/*/" rw,
"/var/cache/*/" rw,
mount options=(rbind, rw) "/tmp/.snap/var/cache/*/" -> "/var/cache/*/",
"/tmp/.snap/var/cache/*" rw,
"/var/cache/*" rw,
mount options=(bind, rw) "/tmp/.snap/var/cache/*" -> "/var/cache/*",
mount options=(rprivate) -> "/tmp/.snap/var/cache/",
umount "/tmp/.snap/var/cache/",
mount options=(rprivate) -> "/var/cache/",
mount options=(rprivate) -> "/var/cache/*",
mount options=(rprivate) -> "/var/cache/*/",
umount "/var/cache/",
umount "/var/cache/*",
umount "/var/cache/*/",
`
// Find the slice that describes profile2 by looking for the first unique
// line of the next profile.
start = end
end, _ = s.spec.UpdateNSIndexOf(" # Layout /var/tmp: type tmpfs, mode: 01777\n")
c.Assert(strings.Join(updateNS[start:end], ""), Equals, profile2)
profile3 := ` # Layout /var/tmp: type tmpfs, mode: 01777
mount fstype=tmpfs tmpfs -> "/var/tmp/",
mount options=(rprivate) -> "/var/tmp/",
umount "/var/tmp/",
# Writable mimic /var
`
// Find the slice that describes profile2 by looking till the end of the list.
start = end
c.Assert(strings.Join(updateNS[start:], ""), Equals, profile3)
c.Assert(strings.Join(updateNS, ""), DeepEquals, strings.Join([]string{profile0, profile1, profile2, profile3}, ""))
}
const snapTrivial = `
name: some-snap
version: 0
apps:
app:
command: app-command
`
func (s *specSuite) TestApparmorOvernameSnippetsNotInstanceKeyed(c *C) {
snapInfo := snaptest.MockInfo(c, snapTrivial, &snap.SideInfo{Revision: snap.R(42)})
restore := apparmor.SetSpecScope(s.spec, []string{"snap.some-snap.app"})
defer restore()
s.spec.AddOvername(snapInfo)
c.Assert(s.spec.Snippets(), HasLen, 0)
// non instance-keyed snaps require no extra snippets
c.Assert(s.spec.UpdateNS(), HasLen, 0)
}
func (s *specSuite) TestApparmorOvernameSnippets(c *C) {
snapInfo := snaptest.MockInfo(c, snapTrivial, &snap.SideInfo{Revision: snap.R(42)})
snapInfo.InstanceKey = "instance"
restore := apparmor.SetSpecScope(s.spec, []string{"snap.some-snap_instace.app"})
defer restore()
s.spec.AddOvername(snapInfo)
c.Assert(s.spec.Snippets(), HasLen, 0)
updateNS := s.spec.UpdateNS()
c.Assert(updateNS, HasLen, 1)
profile := ` # Allow parallel instance snap mount namespace adjustments
mount options=(rw rbind) /snap/some-snap_instance/ -> /snap/some-snap/,
mount options=(rw rbind) /var/snap/some-snap_instance/ -> /var/snap/some-snap/,
`
c.Assert(updateNS[0], Equals, profile)
}
func (s *specSuite) TestUsesPtraceTrace(c *C) {
c.Assert(s.spec.UsesPtraceTrace(), Equals, false)
s.spec.SetUsesPtraceTrace()
c.Assert(s.spec.UsesPtraceTrace(), Equals, true)
}
func (s *specSuite) TestSuppressPtraceTrace(c *C) {
c.Assert(s.spec.SuppressPtraceTrace(), Equals, false)
s.spec.SetSuppressPtraceTrace()
c.Assert(s.spec.SuppressPtraceTrace(), Equals, true)
}
func (s *specSuite) TestSetSuppressHomeIx(c *C) {
c.Assert(s.spec.SuppressHomeIx(), Equals, false)
s.spec.SetSuppressHomeIx()
c.Assert(s.spec.SuppressHomeIx(), Equals, true)
}
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